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Published on: August 2, 2018
Mitogen-Activated Protein Kinases and Hypoxic/Ischemic Nephropathy
Fengbao Luo1, Jian Shi, Qianqian Shi
1Department of Urology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu, China.
Abstract:
Tissue hypoxia/ischemia is a pathological feature of many human disorders including stroke, myocardial infarction, hypoxic/ischemic nephropathy, as well as cancer. In the kidney, the combination of limited oxygen supply to the tissues and high oxygen demand is considered the main reason for the susceptibility of the kidney to hypoxic/ischemic injury. In recent years, increasing evidence has indicated that a reduction in renal oxygen tension/blood supply plays an important role in acute kidney injury, chronic kidney disease, and renal tumorigenesis. However, the underlying signaling mechanisms, whereby hypoxia alters cellular behaviors, remain poorly understood. Mitogen-activated protein kinases (MAPKs) are key signal-transducing enzymes activated by a wide range of extracellular stimuli, including hypoxia/ischemia. There are four major family members of MAPKs: the extracellular signal-regulated kinases-1 and -2 (ERK1/2), the c-Jun N-terminal kinases (JNK), p38 MAPKs, and extracellular signal-regulated kinase-5 (ERK5/BMK1). Recent studies, including ours, suggest that these MAPKs are differentially involved in renal responses to hypoxic/ischemic stress. This review will discuss their changes in hypoxic/ischemic pathophysiology with acute kidney injury, chronic kidney diseases and renal carcinoma.
Insights
Hypoxia/ischemia damages kidneys, but signaling pathways remain unclear. This review details how mitogen-activated protein kinases (MAPKs) mediate kidney responses to hypoxic/ischemic stress in various kidney diseases.
Area of Science:
- Nephrology
- Molecular Biology
- Pathophysiology
Background:
- Tissue hypoxia/ischemia is a key factor in stroke, heart attack, kidney disease, and cancer.
- Kidneys are particularly vulnerable to hypoxic/ischemic injury due to high oxygen demand and limited supply.
- Reduced renal oxygen is implicated in acute kidney injury, chronic kidney disease, and kidney cancer.
Purpose of the Study:
- To explore the poorly understood signaling mechanisms by which hypoxia affects cellular behavior in the kidney.
- To review the differential roles of mitogen-activated protein kinases (MAPKs) in renal responses to hypoxic/ischemic stress.
Main Methods:
- Literature review focusing on recent studies, including the authors' own research.
- Analysis of signaling pathways involving MAPKs (ERK1/2, JNK, p38, ERK5) in hypoxic/ischemic conditions.
- Discussion of MAPK involvement in the pathophysiology of acute kidney injury, chronic kidney diseases, and renal carcinoma.
Main Results:
- Mitogen-activated protein kinases (MAPKs) are crucial signal-transducing enzymes activated by hypoxia/ischemia.
- Four major MAPK families (ERK1/2, JNK, p38, ERK5) are differentially involved in renal responses to hypoxic/ischemic stress.
- MAPKs play significant roles in the cellular changes associated with kidney injury and disease.
Conclusions:
- Understanding MAPK signaling is critical for deciphering hypoxia's impact on kidney health and disease.
- MAPK pathways represent potential therapeutic targets for mitigating hypoxic/ischemic kidney damage.
- Further research into MAPK regulation is needed to address acute kidney injury, chronic kidney disease, and renal cancer.
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